Refrigeration – With indicator or tester – Operatively correlated with automatic control
Reexamination Certificate
2005-03-22
2005-03-22
Tapolcai, William E. (Department: 3744)
Refrigeration
With indicator or tester
Operatively correlated with automatic control
C062S129000
Reexamination Certificate
active
06868678
ABSTRACT:
A non-intrusive refrigerant charge level indicator includes a structure for measuring at least one temperature at an outside surface of a two-phase refrigerant line section. The measured temperature can be used to determine the refrigerant charge status of an HVAC system, and can be converted to a pressure of the refrigerant in the line section and compared to a recommended pressure range to determine whether the system is under-charged, properly charged or over-charged. A non-intrusive method for assessing the refrigerant charge level in a system containing a refrigerant fluid includes the step of measuring a temperature at least one outside surface of a two-phase region of a refrigerant containing refrigerant line, wherein the temperature measured can be converted to a refrigerant pressure within the line section.
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Refrigerant Tables and Charts, ASHRAE Fundamental Handbook,pp. 17.15 and 17.23, 1989,ASHRAE, Atlanta, GA.
Chen Fang C.
Kweller Esher
Mei Viung C.
Akerman & Senterfitt
Ali Mohammad M.
Tapolcai William E.
Ut-Battelle LLC
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